I've got Pinlock security skewers on the front and rear wheels of my folding bike. I never travel with the key but most of my trips with the bike are local - errands and stuff. If I ever flatted, I don't carry a patch kit and would just catch a Lyft home if it was too far to walk.

If ever I lose the key, I have the code stored in my notes and can order a new key from Pinhead.