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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f847b64507fba7400a4ab316a4d407f34a91c89ac6190a076f947d1373d9fcc' 
  AND token = '0jgyW09ThLn7NC61HmQQMKu0oBzJI+v6AYMdnJJd6eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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