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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a1b6a91d38f22de31ac5cf1c271cb03b5032fc5f18ace2f604834ee6a43690' 
  AND token = 'tNvIGeGDJHYkXgrZTixmfv9SU0jxI8Uz6RBhWT44trk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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