SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '465649ed550fead35dff4a13ab74c3634398f6f3658061ed2bbc141189719a90' 
  AND token = 'qBfAeJm5uNjaoZgB3x2sJ5/pXpCUELBhS3IqDKUMNHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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