SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa693baefc025cec24d52d5de4aa261ac5252284ab42a342189fa8455d6f62d' 
  AND token = 'iy9cHsZP8BUIZuDDDy/3nNOHbwx5oY70eMGw6/9jBK4=' 
  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