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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d934aab85a48c6e0d7b2ca296b65c73911c4a7f4a21d21e0afd159300732a34' 
  AND token = 'fUv05MbfCUp0ivB+npxI26IfHbGa8pPnlrjmwFOMOkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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