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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d342f50ad769741ef0808b3717a1ddde4a79932d94bcd3da8d36ed3298668c5' 
  AND token = '9oE7rW+IHOFAyH+gNrAISJ8zqHYf0nm5U5XaLWIhVjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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