SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde1d3e8850ba843c65ba6ac74aa9871ad0dc1a9195c9f7bf6c64562410e3595' 
  AND token = '5KfP4IJBAh4hnVuaF03LvhMWFJ4KGcotGDYigxZD7qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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