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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f544e3e3116e99f03644f581ae579cc0fb73af45a17f59b1b391c4e034ea3e' 
  AND token = '8/0ntuVFao927DrK729Z5wYRX8Dwp+pBhqqfrMY6NQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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