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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7f00567ab68734a33593531d123b158ae065bbdb617efba7c3de1cc5255e6e' 
  AND token = 'zyNogk1Y7Y7303PtbV9ZnRimwqh40czCXc8Hli4Cetw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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