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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3657be5cfd67348b355b245d7ffb966ce9ed35b3e040399b8991cc525f59773' 
  AND token = 'YYD/8gkQCLkMZ3BPC8PUf2CbmkQL6ctL6vBNuM8m6dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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