SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d6b942302ab8638f0d5f104f534eb7666cff284f91116fe234806d1a51ed38' 
  AND token = 'CK0DdWGdg5nnBhnPV7Toiswrc+muVKa6yI6ai3o+TQg=' 
  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