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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7baf9b825ff5c8235521a36aad1fd79ce530bb660c15a84af7d7ef5ff53d6555' 
  AND token = '/jiuOuY5z9/mXZjrX+jmq3RqHa6fQ2mbdjKP8sIC0LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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