SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f696cc7653e7859288e81522e9ba534fa767021ff461e9bc6c2f88a1d70905' 
  AND token = 'gujLlNzjykvkhGqwQCmuJsKLhpchWh0WpsxIkK9BGGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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