SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd2a446e94863431547b35b3aa34cd4f93ae82df3ea7bf1fcfdffe9573be9b7' 
  AND token = 'gCAsAhx2EGdP/QxsoYdVGFn7pMDWwK8lzDZoUlTsBIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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