SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43ffa2a9e814127218de3bdf0a26184c30589b08fa682d936d42b99de446f455' 
  AND token = 'jYVQ/+BEBGsCrGj+2w2LCbr7RvJIoARem/QThpyCVoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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