SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd992ac4a935a79b2782e5339a0f8008b6fd23e8c1a030ed16a886f6845f673e' 
  AND token = 'BvKY8REFDG3HbLn7pIlHVDWGvEN3MK05+P4W2O25Uwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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