SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b445f7354e8bb73400fbb12587a98c7a2a493eacd8906fa379495a46092e95c' 
  AND token = 'QFYUgBtZ6WHV+fOcYDlnaRYCBoOtLPLUqp/FHT0X4ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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