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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21359d13bd0b1ba9a8945c4a0056ec5fec5df09a7d84dde6f1ef8e4d648b3e5f' 
  AND token = 'GPTIFhFukyH964Enk1V9Thnl20yCcb2euTD7FV3d8cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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