SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025d98d4324caba34aad44990d6c9431e85eda27246640f5c8b0768211f0cfa9' 
  AND token = 'QeJpCV6TbgjQtUqBp1uRZ/nSkyn5dPSK4DBlB2sJbqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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