Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99865408ee62817350778515babe0089ccee59a1be5f1e78b879b691a66cb92' 
  AND token = 'ywL/YdySgNRtQMzuEx3363x+uXHvQpehGIKKV28/FaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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