SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24d706109ddb15691bbdf966f3963b86375993f9de28f5cf7e255cf094227ec' 
  AND token = 'eZm61zCPA9v/qRqsyslwlL9mnZQa0g32rNhopYhblzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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