SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ed4c567d37beb10b1f68162a83dcc6939aad3739c42b4117ece902289fddc7' 
  AND token = 'p/qAMpyaowDg+WBheSt92FznSB/fyvEIof7EJVKcKxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}