SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '465efcd7789aecb901665abf9f8a12432f7fd79eff22b8e2d90068fc157c65fd' 
  AND token = 'wvnUisNzxwgrAMw4UMxVqUDMx9OYI0YTJsQFGZHQycw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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