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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35406e93902c58c6d94b45dbfcfa8c113c3f58d476eb7e39edd5bdf03d7d9403' 
  AND token = 'SnCySOUvIc4yHKAX9mOxSp9f9772zrmeU7+oyn3h3u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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