SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd442dc5aae3ef53237878a86d96a5cc028e2328f93b54c754f99541817162213' 
  AND token = '65EpiBdLWqhG6ak/6P+OlbtDpM/chZkT/98FwdwVf+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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