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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41c12ed43a865b923280c9a1ec9a70548f01e3ae8bfb027383b4949e7733315a' 
  AND token = 'fsUBgKIdhgNLt8JacBLfL89AlbTamjuUyIAZJeIIsKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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