SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56afd811d0f299543b31cb59a052bc9893a3746cefaed4ac1fe37034c919116' 
  AND token = 'zxwuF1Q6OFr/WCGvhYxPIs0V+1OetDHq4WDYp5YFTZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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