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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbbe057cb06f17a09945eb47ec86be4020e62f71f5139910eac46ff582c15b9f' 
  AND token = 'dsiwxT5akAp1SOTBXO8p8g7yN34lkc1RX/07Hlo1KW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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