SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179892958e31cae252372065737efea0c32868896999a80a43a339d9bfd3c002' 
  AND token = '72LfNBLqP4lkxdlQ/uK9LPA+StWii5dzjGnZ4rgYp5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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