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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de28c87fbfea5dae974b42d971aa39de290f928db822e116b65dd05b5b36c55' 
  AND token = 'T8S+wdQeNIPjap1se1eYBhcrC3CEPZW0VbLc7UeRHvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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