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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c66c751b5e73f8cabf8e94168317e8149c34b69e30036e110ff01e40ed11ee' 
  AND token = 'K324wdQebACDBGUtQ1bMyrzPYxk1FUqAQ+PPHBQdWjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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