SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fb56a7a3af92908fb49834a1d8b6d7829db61c90cd6b0f10385f378b6d40ae' 
  AND token = 'T3fyVY//dcfXt4msCxJOUFCZw45IHlOH5LcwQeRvZqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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