SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e07b0c8ec65d4f99d457dd64df194bc538b3077a8de282f3a91e77b21000b21' 
  AND token = 'ZALIvQny3IVh4/mwPWUAymXh/aPSZYYK94lOIOt3r6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00121

JSON explain

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