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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c8bfad39afdbe41973ee6e343df3502ba0ee84b3f9d03511171d2a1f783b9a8' 
  AND token = 'mboDcDuo3mMvK82/3Hgxvb7TR2UWuYVPHkd4IxL+N6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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