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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba28a5cb030706b134780a5e31797d83dc844a8cb131f6ce8e0805c4460cd4d4' 
  AND token = 'kVbZl75GIrX+qt+ffOXtE6rAEefEGbjBXgMU0vwj/3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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