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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176ef59ec5881fdda32d5ff324540d32743f5ce60ccc9e94feca83283598a479' 
  AND token = 'i4uCms2GHQNv65i1mDVJD14P5IaQyNj2mQgB73F5Eto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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