SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fe02cb95fd2238eda58cda127edcd78a090818d0a6c70ce6fd0986d1cf9bdd8' 
  AND token = '4KdRdrLOaU0IZsTcVU0X8/o0kI7s7VuBbZYVNMy6vp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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