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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717acaca19a32bacf05779bd418c4349f024ac6ea9af58f2f648f6c28d39d8e7' 
  AND token = 'QWV+5C1LmqkJ+290zQP8erYphQfeQrOZ+Y54eY3nBJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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