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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a23976859e1e134f761292ca5c49741998af7de4cc15099bcbacbfb5cad7e2' 
  AND token = 'CC4azgCUluftOA52Ds/imL5m8Qnfy+D9wqUt0HIfX7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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