SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b9dad54bea9e3203a9fed487096d8f5cb697927661b14f4257df61d6ecc7f8' 
  AND token = 'NnJtXUG6wgrHaggHMVZzeN2jQrg6zzeliKt0LvRM6nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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