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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02bccfea646b554fc8ec005ded06000d711399860bdf40b6df21f20ea1c2cea7' 
  AND token = '2wZxpmCoHctM5j6+7oLzoW0jhcucCN4eQlkB7gt1RaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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