SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849a482a59c0b2c4ae802bd130c70dbf2cb5303f773b68dffedd66bf760b5711' 
  AND token = 'GvY399FylSbSUhEzmBKztHi4NGj7g5YsJFlgSAEot/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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