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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c3d8fa3cead1fb215317808e435da3874a93e242264156ff890ad313e124aa' 
  AND token = 'YEEkVGbUbIwKkTGU11oD5vaK17aY5IsYDAGfjBJX9uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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