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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7de5bdd0a66d6b202a87eefa885e26c711517f05c27e201361ac54cbc828443' 
  AND token = 'elsjj3fCd72N8OGP/QOLo1WmvaGO3Hh3ZkuXQtEZje0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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