SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ed4cd4a08c201014da79cfee91aff0a1ba05be22b3ca1994c610d46a5b85bf' 
  AND token = 'uC8d/8xfoWd4Kg6yxE245OjiZ9vF33SHADDd+82DQgo=' 
  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