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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d283c7aeb70bb77c145e3f56c9bbe13b0af71b5b6299d239abfeb0a1285610' 
  AND token = '+UD9JSYkgFmEPeiM+0TAB7Rr9XaHQO3yH0W5io+7avU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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