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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30654523c4dc575dd1c0202d4d68d85c59a28e57b47da22185b8ad85467b7c24' 
  AND token = '8sySudgshZbfkoWG2nUm4y+zpmUfkd6CcO0yEk8FkHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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