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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9fddc7bb1e66f74eaf62f7391db3a6bc5b70c1d39e69083ea15692d59355f1' 
  AND token = 'uS/kkWyXkRcRr0CIKRjGpe9lHWH1BY+J/mT45EACuxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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