Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de7c018a467c63aaa0ebd80fa3894de008660d9ca209581fa1034256f3858413' 
  AND token = 'gMayXwYNW+tb33Vbhx06PcrdVXGSK4KffA138xARzhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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