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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10db2228343ed02a2f275148809b76a52f2a2a6741d4f6cec1c53a166f6dcb27' 
  AND token = 'bGxFpXKefMvewzA3pSx5lOaNlFze7BNLWBL1EUz9+bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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