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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79bb133c76450a775bc168414854862e80fd425d7a88e74324aad6823bb0525' 
  AND token = 'sk+gYnJ2x1KbpywtpWiypj7DIMcD9a55alYUB8qvS7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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