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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19a228ea49e156af042980223dfc7679382ae4750074fd9af6406c87a45ce9b' 
  AND token = 'xkp+82tSag5YWh+LbOZ5UFt3fnNYmLNpTXwt8S/pDzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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