SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c535099731f8c3af3a57de0258feac1b94e3d85964375862163c8a4caae3f7' 
  AND token = 'UrM34O3DahgdtXKTUtKvV1IZ+LPqB/oImojnU6eAWKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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