SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a652abc13f3307ca407c844f7dff2ad5b3621035050e894678c64b29760c1c61' 
  AND token = 'Jue4vCeQMz/vR/XAZ9Vaj2nCUige0++7oKWlfTqb5pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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