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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ed52559f58231792556ae45a5e63fa49526bf23aca818a58b3c7a15af2927f' 
  AND token = 'IvM3Q8D9t82YBuaJr5elFCLAxq1jgzCir5zPkjY4KT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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