Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e50cb7628abfda5f973f790943e7e8eb77d96c281d6cf0c450577ac28abd70f5' 
  AND token = 'zpKcC83NzHLqgtIiceBC8QncZyHYbCFSdOQUXyxGjDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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