SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f45e85cc46fc1f68cb41f049edaa26e0d68f35e3f44cad53b79a9dfb38bae8' 
  AND token = 'O4LwbzyUVMYtmzkkoPtg9rhoSFe9kOGqJgLMZRR/+BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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