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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5daca1bc897193bf4e65e422f8c65d842f303ee259ccae9b069bbd4cef279015' 
  AND token = 'BDr6eT00dxBidlYBYggfw0ZJwHtD2gXOeKom1IvN0Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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