SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01fbafd4764774a42957bf5b0653071c80e04022dc46f9297e99eb49f82a606d' 
  AND token = 'pBebqJsMFoUGsWBZl9ysTv6Qw+xAbj3WqNWq+nkYAvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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