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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823772a694ff7df3999db71a2b48a6ae1d7cd3e08cc1652688e8c402f3c5863d' 
  AND token = '3/olQ5HIUIXIdBGRGUkfyowZ2WXuS34iZkQ9vFZar68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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