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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38cbd3e4f3f167c8587d846e8be3709b4262ae158aeac8d0c94060bb57f3d767' 
  AND token = 'b+6qmlp6EH32SAlEI0oNsE6aWISgxCFhk9Bk09RRzp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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