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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b65cdd7133cbf1460a61462abbe7b11844d6cb066172af1ad030a40ce39311c' 
  AND token = '/ArH0GMmJQoQVhGTiOXCbleoaK1E5dUz+SW3ehBsyA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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