SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabf6f798665f19a19523a970065d0a7c1a520c1a8ce7a0c018ff809025ae2da' 
  AND token = 'zsLekZwjxup0m5jBVP6OFgvVBZeboqV7XUx8Qs6dG34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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