SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9cc803f6574b38f00250874d9863d75f33c88f8b648930e5fbc75a71a56ba1' 
  AND token = 'MEGJ/iAfvuheIPHphfEm6bz9SGicoZKs7rk4hjBMgvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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