SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa7126f8cd251936d77e33771b1ff4401d67dc0dc6033b8c5d23d8bfc0a8bfd' 
  AND token = 'sGd/ZXD7GKIM+qIecmraxIVCbrT7+tfE4bhDsvWdRek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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