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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a8b1ba6bc96c552c2d40ad30554d05d8dccd31e466a376a63fdfd334a43e22' 
  AND token = 'wD8xPVqmfPO6GA2waBY3qinBjXy6uNuZhXBnWRrrERo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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