SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0027e99d926143649c34b64ff6a8366d716fa98094ec9917e4cd4eb8969d15' 
  AND token = 'RAOKZq1rL7HnlKWMLm0jBbDZzea/6Q+GvMRrlFAOVqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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