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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d7df04f547df20a882d1d50e9db62197518deaea8863e89cee1c0de5ed2ae7' 
  AND token = '0r9eXYREPD/LPwQVs0y2MlzS9Mejf9SWOpqikPLUohI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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