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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040b91495c6a6cc28f7ded9ad056bdac2f1a2970592f4883699ad3cb390014d5' 
  AND token = '1a2sCrIuVzD9W2MBc3+89bG5OpYlAiNYKyRYMPjaxqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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