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some sort of scan for car keys?
I don't think its that. Thats not equipment you'd associate with car key cloning etc and thats also not how it works.
The device has a screen on the back (you can see the light from it as he approaches). If anything , I think it might be a handheld IR camera. Can be useful to spot alarm sensors and/or inhabitants etc.
Edit: Here you go https://www.birminghammail.co.uk/black-country/burglars-using-heat-detecting-cameras-17518165
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Yeah looks to me like a IR or thermal imaging camera.
https://www.test-meter.co.uk/flir-e5xt-thermal-imaging-camera
some sort of scan for car keys?