SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4523bae50559dae3cac29448f09c553b4ffbbf9d922a3d34d0c4108bc6a6aec' 
  AND token = 'HhRvn0IKTQOO1lfm84npMBpVku/6kJDNGZ+PhVhsuFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

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