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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3686f82afca1b16a7c3c668014dc42fff2d10177d235218b093d360b53487a5' 
  AND token = 'ZQylkrhBxKOQasLXnPzifj7yTqsy7I4tSaYNQnJkKzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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