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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ec01d6028beb8268acb338c0c96f6e61bc02a80079d79feb422a945efac3fa' 
  AND token = 'LzVlelXZJcsNMp97br76mZp3ZmzdAeknp8h3pPeZ9do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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