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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568dcc3b2b42a867c59f4e94504008f573d14f5bf1eaec8b8fad540a27c69e33' 
  AND token = 'Lha1D+WUTyZAoblpy1E515xnLJI7l8XUHAq8UHImM4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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