SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0bc37b76541cf363c383f9d6980655354aa7c2454cf423eb2d02f234da180ab' 
  AND token = '8MsSUFp1Z5uEckxPnAGK+B/IKX54SZLVveVaphZWKMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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