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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb82dfbe7ce7dccec8fc0f1292832e3a4d54fe32f171e21ddd2783385aca690' 
  AND token = 'qFn5IWF8tJ85sSIdODS4EzDJzcRMcov50BaW7i2kdTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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