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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3d471da7543a1e4ffbda0481426acfd01e5394f96ee211d1d774d7d3c8c79f' 
  AND token = '8NdiJS5AnCUrlQrivN1tjhoIIIzpndjOGt2lpHOg2N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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