SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea99b7e65188b526a46028dc498effd3ae40fd7dc40e2c7b380f0a3af66521f' 
  AND token = 'ZqCpNXEUwLpXz4SNOsfzlkhgYIpfKpHZmhQJhCp/9+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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