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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced20bd3ab638346ba28bfd6608dfe163b9eb935a2717a2f922d92f58e72b04f' 
  AND token = 'bd2YImg8fKrZZIpKi7/PGN+Gkppg/3Y5pKDNO9LlJ7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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