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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbae58073c3aa441c423a9d645ac14ad0ee3906482ebdb9dec92a49891294cfd' 
  AND token = 'AkILqH2RxF0gb3eHCakwyZjXREltPaVpS8mEar0lg2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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