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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d47313acf7a084d769e1b46c4efedf73184aeddd251d5b18eb7c9697bb132d9' 
  AND token = 'xfGnI0J1OOvpxJyWuLv71bhp5FR0u1LelaO0mYatwpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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