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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b98d112e049e19221dc44d67b9f68efbdd459bd8ae3873663c2bf706e1bd17' 
  AND token = 'sjGOu10vOgSa6GIXwuX4QRUHLNOeA9MnMC5jHt8HNNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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