SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77321c4b23674a32571f8c1f1222bf1c6235d59b112fdc699b4ae4cc9dd6247f' 
  AND token = 'GXlPu6Qb5lKtFM7pCvBVfwMnl4B0llY/QzZ27oh4hh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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