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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ea1a6854073b47140897f194986537c70abd7bb9ceb3f476b3c145f014a4d2' 
  AND token = '2v9VqsU8RagUQWaOaVqRTk5+HUemtBIVsndE0Zu6a0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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