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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320343a96418e5de6bcc6585d90d492ce76592428043ab5a365420c3d2ea0711' 
  AND token = 'qDVd6drWrPL98/ruLqS15FTm9wuekFEWZ5E9raMBKMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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