SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94bba36af76bb156f199e21d0fa7c367d964d87b1664f4fec296c49f8290dae2' 
  AND token = 'LJOYo8BA0QyPGZjXCqC2DqzmngZCnZaUZFlzjbuNPYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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