SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17726d539e7933b19bd43621cc8eef1d057a7118eaa35a3d62004f26a85511d' 
  AND token = 'voyT4WAcvcvfHq1t+xxBv8K/sf/bl7rOXDjx+mBzpBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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