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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0b51c31b57e04ed5cc0c702e9db2e1f1358facb2f049e8386a58a3f995e666' 
  AND token = '5iKlJVosXTc8h5qDrma1dx4ZhV+y8xDwra6RlficY5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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