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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804f52be48087ac83649eb22560d943809d8b4e2ade1ed0b8ce985f453e19701' 
  AND token = 'kvK6I45uOXOIPfVS68mVjCfwN9GinPlSv4tI7LSbJMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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