SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f934ec84523a7618491920e58dbe1858e48fa617398e8f46b9175ed6ceaac2' 
  AND token = 'qKvhrhHxYUS97JnkIcsOZxg/YSLv6ayhVLvua62hIPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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