I see mechanical keyboards all the time in airports. Mostly Deskos with 1x RGBs. Maybe I should snap a picture one day if I can.
Taking photos of hardware in the airport....hmmm...I think no one would care...go for it 
I have to be careful what I'm doing there. A couple flights ago, after going through their machine, they asked if I had something in my back pocket, which I obviously didn't. So they had to feel me up. After they determined I satisfactorily wasn't concealing things on my buttocks, they decided I needed to be swiped down for explosives making. SOooo, I went and did that. They asked me if I made any bombs lately, and I said not that I knew of.
For all I know, they may think I'm trying to make keyboard bombs or something.
Are the airport Deskos just really old ones or are they new? My airport is newish but the Deskos look dirty and ancient.
I haven't paid much attention. Just a glance here or there. I first looked to see if they had Desko RGBs, but when I noticed they were mostly 1x, I didn't pay much attention after that. I'll have a look again next time I fly.