Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ace7a34c886558f3b3d6fa177bef2db8facda897f7ea43683dd2f015573c5d4' 
  AND token = 'FvnPHkVhMTKmbSJAEFnn6IB3WvFl9o998Qaysmz+7tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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