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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e1e9985e876fc7cabe2da9d7d9c27cf649c9e87f70e422a8fe130ecf406237f' 
  AND token = 'Z9Z8G+lpvE0af4iPH6KFgZK0cOCKThNvoqAKX/tDfQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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