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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735d056debc70f645cedf5c00cf68199ba0cce61b61e5065213f1c7d1df4b1f4' 
  AND token = 'AP5G/EgY99Drv7yZCawDAGAjZzPx4tO56p1SuIYkOqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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