SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6eff5f9081393c3ac972a4b7f72714e59a24e0f693426898a560ba9bdf325c' 
  AND token = 'ZhvD5M5vqyA22RNeGkg3pHlVLJBL7JcA+lg7xg2zicc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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