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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdc83a63e1b8262609e7bc91d4feaa39457fe3b7afee13d6ea804a1804d88ce' 
  AND token = 'Kw8ZX2QQfNUH53WDvb+wHj03gh9HIR99m5rK6PijKII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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