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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a408ec2576a195dd8c87715c727cc56539c0bf798e3bbb7e33a399c64924073f' 
  AND token = 'jDbWvSA3TQe6nkZ5VVlPdHrZ/f/0HtUyxH8mQrLK+Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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