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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df985da39f7f6d9f744b818133fee31433405ca0f777b0d72cfd2d8a05df927' 
  AND token = '3KXWGyUtdhfDeQl0kM8oL22QD2UiMQiOqCwhoxRc3CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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