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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4b05c4ef5d07312c4e5cd1fd4b25216d7c7baac6370d48b4420407f8c6baa3' 
  AND token = '3DnGjcAzrxwIcJMMRbY3PJ4kPC5v3+azuXu/AbQWlFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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