SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1481487f58c77c6a6c4c58f976727e5d3ebf54c97bc86525b019c93c154f82c8' 
  AND token = 'yEpYZqDhWtLWnj7zPtR+eZBNPqm2/bG1M4seRHJw9qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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