Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8891478cd19105c6247145251db8a83ab04b86b19a6db83eee813d688b9e52e' 
  AND token = '39pF6/wOwh5gFzLYeOJXrWy6DDHdyDYav+g5kJqSxB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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