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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b9cb80a5a4db79b08280518bb88f31b5525815bc52877488b5ab51b315c8d7' 
  AND token = 'A5bw18YKlfgurQe1PomGP5aCD9xrwCqjC+W1y34v8mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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