SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07007d0084f565f5a15355f93e20d155f71049e78096c2ea2d612bf96396d079' 
  AND token = 'piTl1j8zhjtlps9t4JsPv/YRg46DVOFq2ZJfZ6xG44s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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