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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ecbb77298949e068946952d8660a99ec906b23d1588e7ef3bd70c0930e9f08' 
  AND token = 'xPc9IuteJ22BztGbI5tH2Hd85Mqj2vVNqlQTQkftyBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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