SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa23c65a8a1a91ba158da86376c8918e1c1bb553661a56a2d51bb5c851b095b7' 
  AND token = 'xNdiBBazud/bapqKc5+piiARf7hIFlfuVc5nF/hhEKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

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