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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c79baf8ad14cd4e175aa9b470217928e45a14fcf537d7707be0fc64a95bc987' 
  AND token = 'VRWh3LDR7x9W1BenCvuFcwRv1mXDNJj5VE/QQUz8Kl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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