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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94e04f0f7076f534ce709a43a2152f2fbea247067198e2057eb8b4c9d8761cf' 
  AND token = '72aY3ULYheNVl/xEKuvCQpXDEr4I+sJzS+XooZ9Za9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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