SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff79b59eeb84484061eb6fbdc9d7b2924abc325074e6dd018885cb8792306e8' 
  AND token = 'NzH4o+Wq/l5RhCnCvVMFTLiIcPIVZ/vACE52vbs0rVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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