SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64acc051a03996656a52d5f7ddb7bb6bf2b7ae97d5f8c405fa9298c558be3f51' 
  AND token = 'EzEmaab/+o1L/qCP+2AbAEjMoF4G0hgwRnj7hjQRK+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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