SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee31576439e3739218bfae4cf52b12323f1595b55a7176075fd6db04ddc6fc95' 
  AND token = 'nuAwzL7O6M+qqQBViL2qq1SEUNF6zY/52L8ZqHXiDIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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