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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89bfad054c40bc169ad7097e5706963e3b77dade11a692f8f7b3a3b7cb23f46' 
  AND token = 'YP5BTN+ApqIvXoMyQ0Q+Quw9STEtEmaIEgCFL/m/ibs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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