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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29d400b36a95b0041e56f23d1ec04b7a020089a2bf408a26973e9d239b2e39ee' 
  AND token = 'De4dXGIHCFTyh3Cwej0rH5OVZhzie2m2jDzmAT5Rjo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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