SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada9806993882cb6b4f7abd5ff6481e74fbf27391beb55f363e5f637885e2965' 
  AND token = 'ZKmzrJQXX62CanTqLi1SqynFWd/YqwIOy1RnDPhV0OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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