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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239a518fd155f12f2699f87aaa44aada90af8cf1f24951b8f4f1baea3af39f74' 
  AND token = 'OeSUiLrEVKYvUXgVX5225qXDI9SZyN0nIjMtWMlXlZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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