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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a2b63ed0c9ac9845ab315e0869520110d2666d9f8bdac3f04268a28e130e814' 
  AND token = 'cRac0AbNgZYwFSJpxYo9eY6WmwrzF1vofttWlFZAPzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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