Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c575047a8a04d5d3db2bd315adacee4068244530224c2eebae9a140fb86caf' 
  AND token = '8+lCfUb3mjyK3rxvaxi7CvfcDqQWwL+yvVn+8TrHT+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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