Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bebd33db05d300b237ce6c51f7738a4f496ba186d1f2db018f579862bda75fe' 
  AND token = '75S00OGvqdexf5azgrY1vjIzZMC+ysYmBS/1ssHsBTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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