SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f240445715cd1dedb187eb4454544541bb037bdf6ec90cfd135b8f3636a6bd' 
  AND token = 'HXrreXWdzKRgVSw25A/OVPQDQRfUv38J3YbVjcAHBls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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