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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dfc4081e3fc9b0776484ae6a8d47f609ceb1980ef5c4587d4557b4d692d8c5f' 
  AND token = 'cRIBTC3wcxnm9MHlfG/9DGurNNp+sg0Z7DkpPkWBYnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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