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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98780ddb1de13e209419a6df7bb1b4dea674f597a6637c17dad3a6bfd7a8fa3c' 
  AND token = '5UA6jt4ArP2k6fEFqgqt/eobI/ZXkXTr3n2pVwd1S0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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