SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf4f43a16efc82ef5580a00cea98ade39369546ad95615ca523a6bb7bdb1a4a' 
  AND token = 'D/pfwBzRhheCLj354aGKzFmIvyKbMrptXoszfWlQ6Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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