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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822a69b07f659bc6f2ab52287fcf0003d6096141b3aa1b7bc9fbde43ec61f639' 
  AND token = 'fpGBWNCPuOzA5Dr7G9Q6RQtTAcd9gWM+9jbkErk/WhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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