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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2467be60c57061ee856c54f76c7be0a3024c2b35b9e1aa17e1795982f66d9c87' 
  AND token = 'cc+eWfiuqDNbOb6TJYTaGJuvXi5tJtocd4FEsKr8P2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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