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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568e409db87fb3ef12b9936a6c380a4cbb4cb08e9d0972438d213ce1108f18dd' 
  AND token = 'qvRohpFs0l3jbmCgb3/+U65UWUJHZTahHdWQ1nYYUN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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