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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36b4faa9ba9ef8e45797f8fc8834265c1dfaf0dbcea4dd94d94cb0941d778e9' 
  AND token = 'woU90q+68WL5mAK5gHeSUcvW8OjEujwKYkKnfmqsmLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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