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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a28d8b46aefdb84b231e65cc7d10e79ce17b02949906f4cd3fe9958829856ff' 
  AND token = 'DzDNA4XiCjC7Z0RfFueoCZvD+YBfEJ+LXvzs2y9xkwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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