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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bfc51eadbec387fd2d040f96cc88f2f56ca712e90925a31e038f1338f614d46' 
  AND token = 'N5J1gNwJnjAGwgwN50UWjFEP8jsMPadxGI9FXpMoTYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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