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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ba85fe9fa1d3b83cc1ab2f78188c1c95f8eb4227c38fd15dfa059f154f8039' 
  AND token = 'U/BTQMbjSlYLFUymU41nGIeH4lrfg0Lfn80utYa8ibg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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