SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eee5f8419284bec84361b4c6933c40955fc08f252a05069b2cb16b74a4d3ec7' 
  AND token = 'JNJeVYghp/WZ3iQ/8cnQlyBpQwh3TXv/tI0QzfhlSwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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