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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59e22204f1faaa8a683f0c14d9ecf9ef9da627a6d8d4212c475558f7e6ce946e' 
  AND token = 'ijZIEWrJceZv365J1TIdQtZ7izPrJPEgdZ6dBRPnzE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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