SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12451fcf0c0837c99b61fb57c37920ef57d86e8411960027f41372f13d988414' 
  AND token = 'wVcc2jGrwPmJy4xE5tS/oNwOPsStYBBL4vlLuWkQCds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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