SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1fbde21bcc29c2bd5de98960a47db0630ce1f3ec9572a3c504d37f05aac123' 
  AND token = 'lkBzuC4lF7C1ISP78vC96zxsqFNV3Zpw3eZKZUO3B8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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