Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9cc27cea36c14b77a5059e16f6aeb5aca2c7c8402bbec84798e91729319429' 
  AND token = 'oxUqmVwBvuoiTiTIJIwKhhEce8UEEq2SDIpg/IaYSv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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