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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a94e0ee4ac94929195d2ac238bae2b1a54bd80f2519c2f33bbd1e4f4dd7d227' 
  AND token = 'exOHdLUPXzdV1ZRi0TjH9KTYBX6GFhQxh6SfNEUN+Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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