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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0496a409ee1dc028c27fa7e48b8e797abcd1f0a4b70c25bb4ac5c4e512906d55' 
  AND token = 'otoRbyb67R8ZFuSwbnOlzkAP0teyB/WxE3tK8RxjMoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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