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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a28656b676bd55020f7d46880ef217f1857159e9f54ec46ff4b86e253090568' 
  AND token = 'DgO0XQ0llI8BVOHcP/y8OlET5SsR4yWevQAR+AVxCj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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