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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363f7fdf2a12c3f17ef016ddf1ff1456e163bea031ff0ed4a8e5b9bb8dbc3d18' 
  AND token = 'MksPdfNIF8YDD458sIhiTF97Ql13fIZN4Zc2J/cGJSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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