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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e323e311b38f4fd7863b4514c54b714d591a3861de8394000488306f0dc3871' 
  AND token = 'uDspOo96WFsi730CPfQkWq+7Zbha3nBdN5whhheu+uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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