SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7af22d7655fa8aee4d8934dc12f13713e5c144d85494da55500cba226167492' 
  AND token = 'SiIVdOHYXoYthFdsWGUQI3gXGq9BncDsIjP/jLQOiSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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