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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ced8ec5f162d5280ef1cfb1003020870312fb64097107ce6ceeb773f1787ec' 
  AND token = 'PgZD3N37ZmPhQ/IoymEVtCH6GfOvCZZH7CT3ZJo6NtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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