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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c1d175d2afcf01cf20c8fe4e7a141f8ed65e3e8001456a257e49a2fe485433' 
  AND token = 'xIAmK5tWv5gDqbG0WcYJhwMsgVtBgQZExqsifvOiZeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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