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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '818a862f051cffe47a109c386b7a07a9c3102f823ea906a66911f31be82332d9' 
  AND token = 'rON3kUTr8xhlFfI5KzNLqG17CitRKZyml8cCh7C7qJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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