SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c0fcc9b05f3cfed9553f56c70f8859723903f13e15d1280e4d3396b7944ab7' 
  AND token = 'u7/byj2BLU9J3MKpbSySDOvC9pntQO/pGh/Fc8zzZWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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