SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7276320e1e227a7cdcfc605a432d9d569eabefe52647388b5e681c9582d5e009' 
  AND token = 'TtGA8s2mgmZ7HyYsP+kmqEOQRBbvVKDlR4Y8tdS4fwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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