SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e24bb36c42e605ed3f4b07fcfebda53465ddaa62fb27a248f95d2d7c12993f7' 
  AND token = 'JUTOKEJwgtntE/Lo96RkO6aZtMYCDzWD6aeTIn6Jh+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables