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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dcd93ff56cba4213d782443585ed17d9cef60832db7b1df1679d1ed872afcfc' 
  AND token = 'RPspf0dcTHY387TmFxUBwV8bAWath3ISAVV9v7d2tKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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