SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2529e40414c11f49dab67c929eb06919a752ddf8e0d8d385b3a1ea925474b667' 
  AND token = 'oOhK7yGzE1JqHmI/O+dVImnhHQGiQ/RNjrfaLR9v4pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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