SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee5ca1e90a7bd4e874ff464441c4515fb6803ac5888bff3cbe9d49191e5758d' 
  AND token = 'WTSt7SdKFM3Q3u/V2/Jf7u2FJfojdzU30wKsLzvGpAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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