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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf95118f7fc6a22d24012c69b80218087365b15ff20c4b0d52b5bc855576c46' 
  AND token = 'RtCFHx05zM6n5UdE4n9L6js/AwV7rXG8dN438tMTFrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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