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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e675829c1c0c20c205dd833ba4aaf0476500d52eac8b05de591b3e4783780213' 
  AND token = 'WcpvPS3vpG2bxCDwK4LljIbCNZCHmhYY9tnwXyuYuHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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