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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2cc8275cb30b97fa57f1bd3fe9cc1ab95a91532b9bae4485b75698cc2c600b1' 
  AND token = 'UMNHBjtLonU0qwpBgD8B9Xp5ZwcRgrBBQl2BgyY12fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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