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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '612853bfe3cafca7e706137b38ff19130ba831d0443dc0f07f893b94d9e7b9a4' 
  AND token = 'ca5RPXyaMkh5GHMLm+IzqRjwhJf5KDmQ5uKKu3zft6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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