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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962a3ce655db29b5690134e1c6c9d494cc1ee8b96fc7f4cd59a9d2be7afd7429' 
  AND token = 'xpLlvgENwOY/SWxsqlDB9Y/1Vfy1HFyfLfUDlsgaHQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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