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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fef0ab9ad6f71a6e815321fdee787e6d1e690bac3ce2e7f93a81026c6d3b39c' 
  AND token = 'CkpPXOldcTru3qRfBQn9wWGdXLY/HXNi5trhBhJ+7Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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