SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559f39830d8a45fd8560fd7662eb3945a6f839d8c767f75d1847305626b03309' 
  AND token = 'AwqNv+w9KY/gl/xdBdspPNs5hZB8sfbGrTvzImAzz4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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