SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c872187fa19751ed5782d5d7825668278aa2c37b2729b24c03fe5663f64a2f' 
  AND token = 'uhUhyHkWKscwmEG/94TVWlnWq3JftvAzk+XGBI7WGYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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