SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1580fa608dd924421af2374e87c16a3b7461e48a2f706c216b07b35c984ba97a' 
  AND token = 'UoHrT4ZuPjhaDz4MyhZjxngAzhQZlNMGhsKnSKYwnb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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