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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd734b4de35ae86ed0c883153a8bdacbe9223dcdd3747083adbda55e26d96b8f9' 
  AND token = 'YG/SJNn2OKhitFbWQ23ApSrvxBqb7tZvTKyZ8tt8lQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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