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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd26fe38ae88a6079850434d8b187018d0bf8e1a6f0a61adde989c9abfee9e82' 
  AND token = '+woL62PRdIljD/bLwuu7kIhFf/PDo1OM+LIYqo1PkbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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