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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f871784d3343a4418a4a6edc53935a11e2929975dbc248e29ff0fb8ac3d371' 
  AND token = 'A4Yi4cNCC5L7IQRzY25+0jycJ10kgNwsfzBtYtXMZmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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