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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86707953d21ff80b3a85a028dfac338883b15f4f3a14d9506a20fa4fb9ba1fd9' 
  AND token = '9OrFilQwYahZilyk/FO/73b5Xh4qMJ66PjsJv0ETs8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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