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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44666bf05dfefa67769cd323705e6bf53a10679c949e5ab4fb1801d2a6465594' 
  AND token = '1mbg5UNFdN6z0O5zpERLtDlF1Le0RmuuLj/7/nvT+YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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