Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d51c2a6a556ec140050ee137386633676a03175ee838694d92bbda5180eb91f' 
  AND token = 'HsopPJnBapRVADpbUmT5VdUOn1X8O6oPMFU1xqOBly0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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