Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c8d1a382694b41024d3e503cb7442b8ffdfb119a53a6d2a144e5a7d89c33912' 
  AND token = 'UlwX3tcronVInSYS5JQekeY7VlmsZ3DnhC8+unlLc6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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