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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5073704b28ef14cf1d0632e385f06ccc544a1577c438d0f45ac3ae02221bed0' 
  AND token = 'vqUTZVERT1WSw5zc9LkR7Ea6CkGdjb1ZQheDDQ4eAhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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