SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b0217be220d4929f08dee478c4c540c89bb9af17230ee3fe65178a7b68910a' 
  AND token = 'zIhIHrMXxBcKKVY+Ud0TmNIMB+1veviw9xRvlJgYYWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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