SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8acf6dafd4e184e9b05b93d72852f2e38984f55c6374c21aadbe5d9c9084c53' 
  AND token = 'GAiKXTdUqeyktumJpoAHqOUHGVtDndBRYlYz2H/ba7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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