SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06604536b57a817e3a5dc0c3593e81f72129e75b5864bcbde47ef51e14f04ad8' 
  AND token = 'VnoZu6vVgDy9bCIn1IChjfft43TgKqDQ3pq/qJATVlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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