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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd632debee9f4ae4f029a5a5643d9cf2f957d797e4d38ad3500c5d983e3d062a3' 
  AND token = 'pWzvyVnAUO7GwUw8T9SIClL6KH0YsCNeJMIvbukTXQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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