SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126a94b9507922501760ed804f6daf36b5a43c74cf430a8b5dc2b3f529202bca' 
  AND token = 'xz0D42yNFfv3+Y07l0WlA1w0KevX05DAU6a5B4i7F4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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