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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a06b21e208a2a77e35dffea7d30b1e9f71e36a9197db7623270893f5e45fdaf' 
  AND token = 'jK2C1UtDbNgkdizApei5GKj/yiKSjsBaZM1eoZkpooE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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