SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05e3bc12c54697bf29a17bf7a9ed64a5e78e4f764773c32ad7d2788c0d155ccd' 
  AND token = 'l7Gpcmj3YpcVIhYrWUxQz5PQgwZT7IBbIELBZZCu9N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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