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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf99e6b5562d8c45d6c3fd26f4d36cd1f743f7843a5a4802ddf7351af14fcc9' 
  AND token = 'JWEK2rAJ2lUyKRYMns2sIUiN/4coog5jpns/0adbjcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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