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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2732ed50fa439e7e591a98b6457908e8c4dfb105ccf0469a3d7c2f2a585bd804' 
  AND token = 'QjwzDTGto2SqRF90ttmWa7Toiv0Wg0GXoTqibLRX3vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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