SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32185d645c4f3076f4ac8b10443fbab83ed443940d177b27ff8b0d42aff3ac9a' 
  AND token = 'IJ3EuOYGHKGgzkqR0B1Wej7MgJpYube79PzvZ/Xd4ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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