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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9342ae1d8ed1961a592d28b99d4a390005bd617b90d56bc2eee6189bfb2ea69b' 
  AND token = 'y7izVK6nUT3uEEh8aNOQebaWN79yD5TVhe0w33RfCDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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