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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f9ae3bb858e9b230991f1e31ee3392fa1576e94fc64763862ad6802bbb4881' 
  AND token = '1zd2JrQTkVaZp6qxU4OLVDtdBEd0QAzJ9ByjkUm6TxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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