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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4390a78c6c4df066d5daa8ab33a31bea6377cb6c5e883958a99a3308ec51e5' 
  AND token = 'DBkvrubPjUC9xtshrmIWU1xBYJM4752KP3phE851XfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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